82) The ability of a telescope to separate two closely spaced stars is called Answer: resolution Diff: 2 Section Ref: 2.6
.
83) Radio astronomy uses to achieve better resolution than optical telescopes. Answer: interferometry Diff: 1 Section Ref: 2.7 84) Radio telescopes image a universe much in temperature than with visible light. Answer: colder Diff: 2 Section Ref: 2.7 85) It takes Answer: zero Diff: 1 Section Ref: 2.8
astronauts to operate the Hubble Space Telescope.
86) No one can hear you scream (or fire a weapon) in space, regardless of the Hollywood special effects. Explain why. Answer: Sound waves must travel though a material medium, and cannot pass through a vacuum. The blast might be seen, but the boom will not be heard. Diff: 1 Section Ref: 2.1 87) How do sound and light waves differ? Answer: Sound waves travel much slower, and need a physical medium, such as air, to be transmitted. Light travels best in the vacuum of space. Diff: 2 Section Ref: 2.1 88) Describe the relationship between frequency and wavelength. Answer: The higher the frequency, the shorter the wavelength. Diff: 2 Section Ref: 2.1 89) What two regions of the electromagnetic spectrum are best utilized by ground-based astronomers, and why? Answer: The atmosphere is opaque to most radiation except visible and radio waves. Diff: 2 Section Ref: 2.2
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